How severe is CVE-2021-26272?

CVE-2021-26272 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-26272 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26272?

CVE-2021-26272 primarily affects Ckeditor. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-26272?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-26272 published?

CVE-2021-26272 was published on 2021-01-26 and last updated on 2026-06-17.

CVE-2021-26272

CVE-2021-26272 is a medium-severity vulnerability in Ckeditor with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-829.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-829
Affected product: Ckeditor
Published: 2021-01-26
Last modified: 2026-06-17

Description

It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted URL-like text into the editor, and then press Enter or Space (in the Autolink plugin).

Frequently asked questions

What is CVE-2021-26272?: It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted URL-like text into the editor, and then press Enter or Space (in the Autolink plugin).
How severe is CVE-2021-26272?: CVE-2021-26272 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-26272 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26272?: CVE-2021-26272 primarily affects Ckeditor. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-26272?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26272 published?: CVE-2021-26272 was published on 2021-01-26 and last updated on 2026-06-17.

References

Affected products (16)

cpe:2.3:a:ckeditor:ckeditor:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:agile_plm:9.3.5:*:*:*:*:*:*:*
cpe:2.3:a:oracle:agile_plm:9.3.6:*:*:*:*:*:*:*
cpe:2.3:a:oracle:application_express:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_party_management:2.7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:commerce_merchandising:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:commerce_merchandising:11.1.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:commerce_merchandising:11.2.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:financial_services_analytical_applications_infrastructure:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:financial_services_analytical_applications_infrastructure:8.1.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:financial_services_analytical_applications_infrastructure:8.1.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:financial_services_model_management_and_governance:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:jd_edwards_enterpriseone_tools:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:siebel_ui_framework:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:webcenter_sites:12.2.1.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:webcenter_sites:12.2.1.4.0:*:*:*:*:*:*:*

More vulnerabilities in Ckeditor

CVE-2023-31541 — Critical (CVSS 9.8): A unrestricted file upload vulnerability was discovered in the ‘Browse and upload images’ feature of the CKEditor…
CVE-2021-41165 — High (CVSS 8.2): CKEditor4 is an open source WYSIWYG HTML editor. In affected version a vulnerability has been discovered in the core…
CVE-2021-41164 — High (CVSS 8.2): CKEditor4 is an open source WYSIWYG HTML editor. In affected versions a vulnerability has been discovered in the…
CVE-2021-32808 — High (CVSS 7.6): ckeditor is an open source WYSIWYG HTML editor with rich content support. A vulnerability has been discovered in the…
CVE-2011-4972 — High (CVSS 7.5): hook_file_download in the CKEditor module 7.x-1.4 for Drupal does not properly restrict access to private files, which…
CVE-2021-37695 — High (CVSS 7.3): ckeditor is an open source WYSIWYG HTML editor with rich content support. A potential vulnerability has been discovered…

All CVEs affecting Ckeditor →

Other CWE-829 vulnerabilities

CVE-2026-1699 — Critical (CVSS 10.0): In the Eclipse Theia Website repository, the GitHub Actions workflow .github/workflows/preview.yml used…
CVE-2025-70974 — Critical (CVSS 10.0): Fastjson before 1.2.48 mishandles autoType because, when an @type key is in a JSON document, and the value of that key…
CVE-2025-0982 — Critical (CVSS 10.0): Sandbox escape in the JavaScript Task feature of Google Cloud Application Integration allows an actor to execute…
CVE-2021-41037 — Critical (CVSS 10.0): In Eclipse p2, installable units are able to alter the Eclipse Platform installation and the local machine via…
CVE-2022-1161 — Critical (CVSS 10.0): An attacker with the ability to modify a user program may change user program code on some ControlLogix, CompactLogix,…
CVE-2020-4561 — Critical (CVSS 10.0): IBM Cognos Analytics 11.0 and 11.1 DQM API allows submitting of all control requests in unauthenticated sessions. This…

Browse all CWE-829 vulnerabilities →